1. Technology
... as methods of transportation has changed throughout history. Automobiles are responsible for more than half the airborne pollution in the western world. Many plans are being developed to control air pollution. Pollution controls devices for cars have also been developed. For example, catalytic systems were installed in many car ... exhaust systems in the 1980s. These devices change dangerous gases into harmless carbon dioxide and water. They also burn up much of the exhaust with fresh air in ... which make even better use of the fuel which powers them. Technology was pushed forward for ...
- Word Count: 1446
- Approx Pages: 6